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We report a new terpyridine-based FeN
O catalyst, Fe(tpy
pho)Cl
, which reduces O
to H
O. Variable concentration and variable temperature spectrochemical studies with decamethylferrocene as a chemical reductant in acetonitrile solution enabled the elucidation of key reaction parameters for the catalytic reduction of O
to H
O by Fe(tpy
pho)Cl
. These mechanistic studies suggest that a 2 + 2 mechanism is operative, where hydrogen peroxide is produced as a discrete intermediate, prior to further reduction to H
O. Consistent with this proposal, the spectrochemically measured first-order rate constant
(s
) value for H
O
reduction is larger than that for O
reduction. Further, significant H
O
production is observed under hydrodynamic conditions in rotating ring-disk electrode measurements, where the product can be swept away from the cathode surface before further reduction occurs.